/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.extension.validation.internal;

import org.mule.extension.validation.api.MultipleValidationResult;
import org.mule.extension.validation.api.ValidationResult;

import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * A immutable implementation of {@link MultipleValidationResult}.
 * <p/>
 * Instances are to be created using the {@link #of(Iterable)} factory method
 *
 * @since 3.7.0
 */
public final class ImmutableMultipleValidationResult implements MultipleValidationResult {

  private final List<ValidationResult> failedResults;
  private final boolean error;
  private final String message;

  /**
   * A {@link Iterable} with all the {@link ValidationResult} that were generated together, both failed and successful alike.
   *
   * @param results the obtained {@link ValidationResult} objects
   * @return a {@link MultipleValidationResult}
   */
  public static MultipleValidationResult of(Iterable<ValidationResult> results) {
    ImmutableList.Builder<ValidationResult> failedResultsBuilder = ImmutableList.builder();
    StringBuilder message = new StringBuilder();
    boolean error = false;

    for (ValidationResult result : results) {
      if (result.isError()) {
        failedResultsBuilder.add(result);
        if (message.length() > 0) {
          message.append('\n');
        }

        message.append(result.getMessage());
        error = true;
      }
    }

    return new ImmutableMultipleValidationResult(failedResultsBuilder.build(), error, message.toString());
  }

  private ImmutableMultipleValidationResult(List<ValidationResult> failedResults, boolean error, String message) {
    this.failedResults = failedResults;
    this.error = error;
    this.message = message;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public boolean isError() {
    return error;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public String getMessage() {
    return message;
  }


  /**
   * {@inheritDoc}
   */
  public List<ValidationResult> getFailedValidationResults() {
    return failedResults;
  }
}
